Honeywell VFD CORE Installation Instructions Manual page 213

• Computer Link Control by PC or PLC (Computer Link)
• A VFD CORE can be set up to communicate on Modbus networks using one of the following modes: ASCII (American
Standard Code for Information Interchange) or RTU (Remote Terminal Unit).Users can select the desired mode along with the
RS-485 serial port communication protocol in Pr.09-00.
• MODBUS ASCII American Standard Code for Information Interchange: Each byte data is the combination of two ASCII
characters. For example, a 1-byte data: 64 Hex, shown as '64' in ASCII, consists of '6' (36Hex) and '4' (34Hex).
1. Code Description
Communication protocol is in hexadecimal, ASCII: "0", "9", "A", "F", every 16 hexadecimal represents ASCII code. For
example:
Character
ASCII code
Character
ASCII code
Data Format
10-bit character frame for ASCll
Data Format 7, N, 2
4: 7, E, 2 for ASCII
5: 7, O, 2 for ASCII
6: 8, N, 1 for ASCII
7: 8, N, 2 for ASCII
8: 8, E, 1 for ASCII
9: 8, O, 1 for ASCII
10: 8, E, 2 for ASCII
11: 8, O, 2 for ASCII
12: 8, N, 1 for RTU
13: 8, N, 2 for RTU
14: 8, E, 1 for RTU
15: 8, O, 1 for RTU
16: 8, E, 2 for RTU
17: 8, O, 2 for RTU
'0' '1' '2'
30H 31H 32H
'8' '9' 'A'
38H 39H 41H
START
0 1 2
BIT
7 - DATA BITS
10 - BIT CHARACTER FRAME
CHAPTER 12: DESCRIPTION OF PARAMETER SETTINGS
'3' '4'
33H 34H
'B' 'C'
42H 43H
STOP STOP
3 4 5 6
BIT BIT
213
'5' '6'
35H 36H
'D' 'E'
44H 45H
M33698
'7'
37H
'F'
46H
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